Pinging IP located on another interface Post: 302657275

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Special Forums IP Networking Pinging IP located on another interface Post 302657275 by NH2 on Sunday 17th of June 2012 03:38:33 AM

06-17-2012

Registered User

Pinging IP located on another interface

Hi,

I have a rather strange IP question...

Here's my problem:

I have a Linux box (call it "turing") with 2 NICs.
One network interface (eth0) has an IP assigned, say 192.168.42.50.
The other interface (eth1) is up, but has no IP yet.

My question: is it possible to determine from another computer connected to eth1 per ICMP echo request that the IP 192.168.42.50 is already assigned to my box "turing"? IOW:

the ICMP Echo request comes from eth1
the IP asked in the request is assigned to eth0
What I'd want to achieve: turing sends ICMP reply through eth1.

I am not sure if that's make any sense, or is possible...

You may wonder why on the earth I'm trying to solve such a twisted problem... It's a epic story... But in essence that is the problem (shaved to the bone) I need to solve for some new use cases of a system with bad architecture that I can't fix because it would break compatibility with other systems Smilie

Thanks,
/NH2

NH2

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LEARN ABOUT DEBIAN

tunctl

TUNCTL(8)						      System Manager's Manual							 TUNCTL(8)

NAME

       tunctl -- create and manage persistent TUN/TAP interfaces

SYNOPSIS

       tunctl [-f tun-clone-device]  [-u owner]  [-t device-name]

       tunctl [-f tun-clone-device]  -d device-name

DESCRIPTION

       This manual page documents briefly the tunctl command.

       This  manual  page was written for the Debian GNU/Linux distribution because the original program does not have a manual page.  Instead, it
       has documentation in HTML format; see below.

       tunctl allows the host sysadmin to preconfigure a TUN/TAP device for use by a particular user.  That user may open and use the device,  but
       may not change any aspects of the host side of the interface.

USAGE

       To create an interface for use by a particular user, invoke tunctl without the -d option:

       #
       tunctl -u someuser
       Set 'tap0' persistent and owned by 'someuser'

       Then, configure the interface as normal:

       #
       ifconfig tap0 192.168.0.254 up
       #
       route add -host 192.168.0.253 dev tap0
       #
       bash -c 'echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp'
       #
       arp -Ds 192.168.0.253 eth0 pub

       To delete the interface, use the -d option:

       #
       tunctl -d tap0
       Set 'tap0' nonpersistent

SEE ALSO

       The UserModeLinux-HOWTO (link to URL http://user-mode-linux.sourceforge.net/UserModeLinux-HOWTO.html)

AUTHOR

       tunctl was written by Jeff Dike jdike@karaya.com

       This manual page was written by Matt Zimmerman mdz@debian.org for the Debian GNU/Linux system, based on examples from Jeff Dike.

																	 TUNCTL(8)